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The hum comes from a bad 60 cycle bleed into the audio circuit usually from a bad capacitor or other failed component. It will need to go to a television shop for service, but I would recommend replacement. $500 and you have a new TV verses $400 and you still have the same old worn out unit. The other cause could be you have the audio and video cables reversed on a video input.
Yeah could be expensive if it isn't the lamp.
Mind you could be a little easier, might just be a fuse on the video relay. If you are confident in being able to open it up, check the relay that runs from the video input to the power capacitors and there should be a small fuse along that circuit.
If the fuse has a broken capsule then you may just be in luck. Failing finding a broken fuse, then I would agree with you on the bulb. But check the blub for any markings or cracks because they usually only make noise when the vacuum fails.
Hope this helps and good luck mate! :D
This problem is caused by a faulty Convergence amp. This amp keeps all three colors aligned together and square on the screen. It could also be the power supply section that supplies power to this amp.
A local TV shop should be able to repair this for you for about $350
I have the same issue, we've had to change our bulb three times in less than two years. now we have 61" expensive paper weight. Our current bulb is less than 6 months old. The TV is only 2 years old and like i said this is our third bulb.
the blue light blinks 4 times. you get sound. then a few minutes the the picture returns... then it goes out, and the cycle goes on.
I have the same TV which had the same issue ( green in picture ) - back on 10/2007. I called Sony. They had their technician replace the optical box ( factory defect ). There was no charge for the repair even though TV was out of first year of warranty. Call Sony.